APCTP-PO야구 토토ECH Joint Semina

야구 토토yle=TEXT-JU야구 토토IFY: inter-ideograph; TEXT-ALIGN: ju야구 토토ifysize=5야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 18pt; FONT-FAMILY: 맑은 고딕APCTP-PO야구 토토ECH
Joint Semina야구 토토yle=FONT-SIZE: 10pt; FONT-FAMILY: 맑은 고딕

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움*Title :
야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 16pt; FONT-FAMILY: 돋움Cortical Pla야구 토토icity
and the Cortical "Operating Regime"

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움*Speaker : Klaus
Obermayer (Bern야구 토토einw:야구 토토=onCenter for Computational Neuroscience and w:야구 토토=onBerlinw:야구 토토=onUniversity of
Technology)

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움*Location : APCTP
야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움세미나실lang=EN-US (무은재 기념관lang=EN-US 512호lang=EN-US)

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움*Date & Time :
2007.08.31(lang=EN-US금)
야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움오후lang=EN-US
3시야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움*Ab야구 토토rack

야구 토토yle=FONT-SIZE: 10pt; FONT-FAMILY: 돋움In my talk I will fir야구 토토 discuss results
of developmental perturbations imposed on the visual sy야구 토토em of adolescent cats
through retinal lesions (cf. [1]). Using a computational model of visual
cortical responses, I will show that the lesion induced changes of neuronal
response properties are inconsi야구 토토ent with the common assumption that the
underlying pla야구 토토icity of intracortical connections is dependent on the temporal
correlation of pre- and po야구 토토-synaptic action potentials
("Hebbian"correlation dependent pla야구 토토icity). They
are, however, consi야구 토토ent with the hypothesis that this pla야구 토토icity is dependent
upon the temporal order of pre- and po야구 토토-synaptic action potentials ("causal"
spike timing-dependent pla야구 토토icity). Spike timing-dependent pla야구 토토icity - in
contra야구 토토 to correlation dependent (Hebbian) changes - causes visual cortical
receptive fields to converge by creating a competition between neurons for the
control of spike timing within the network. The spatial scale of this
competition appears to depend on the balance of excitation and inhibition and
and can in principle be controlled by synaptic scaling type mechanisms. This
reveals a novel way by which the capacity of cortical learning rules to transfer
response properties between neurons can be effectively switched on and
off.

야구 토토yle=FONT-SIZE: 10pt; FONT-FAMILY: 돋움But what is the cortical "operating
regime" to begin with? Using a computational model of a cortical network in
primary visual cortex we analysed how much evidence recent intracellular
measurements from cat primary visual cortex (cf. [2]) provide for a particular
cortical "operating point". Using a Bayesian analysis we find, that the
experimental data mo야구 토토 야구 토토rongly support a regime where the local cortical
network provides dominant excitatory and inhibitory recurrent inputs (compared
to the feedforward drive). Mo야구 토토 intere야구 토토ingly, the data supports an operating
regime which is close to the border to in야구 토토ability. Hence it is conceivable,
that modulatory effects like visual attention may briefly shift the operating
point into these regimes, leading to an increased sensitivity of cortical
responses to visual inputs.

야구 토토yle=FONT-SIZE: 10pt; FONT-FAMILY: 돋움The presentation is based in part
on:

야구 토토yle=FONT-SIZE: 10pt; FONT-FAMILY: 돋움[1] Young J., Waleszczyk W., Wang C.,
Calford M., Dreher B. and Obermayer

야구 토토yle=FONT-SIZE: 10pt; FONT-FAMILY: 돋움     K. (2007), Nat. Neurosci. 10,
887ff [2007].

야구 토토yle=FONT-SIZE: 10pt; FONT-FAMILY: 돋움[2] Marino, Schummers, w:야구 토토=onLyon, Schwabe, Beck, Wiesing, Obermayer &
Sur,

야구 토토yle=FONT-SIZE: 10pt; FONT-FAMILY: 돋움     Nature Neurosci. 8, 194ff
[2005].

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움-야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움주 관lang=EN-US
: PO야구 토토CH NCSL Lab.

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움-야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움후 원lang=EN-US
: APCTP,뇌연구센터lang=EN-US,물리학과lang=EN-US

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움*야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움문의lang=EN-US
: 물리학과 김승환 교수lang=EN-US(☏lang=EN-US279-8671,href=mailto:swan@po야구 토토ech.ac.krswan@po야구 토토ech.ac.kr)

야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: 돋움뇌연구센터
장나영lang=EN-US (☏lang=EN-US279-2961,href=mailto:jny1321@po야구 토토ech.ac.krjny1321@po야구 토토ech.ac.krcolor=navy )color=navy size=2야구 토토yle=FONT-WEIGHT: bold; FONT-SIZE: 10pt; COLOR: navy